Table IV.

Pairwise comparisons of aRR of preterm birth by race, ethnicity, and nativity combined

Comparator groups	Reference group
	US-born NHW	US-born NHB	US-born HW	US-born HB	Foreign-born NHW	Foreign-born NHB
	aRR (Bonferroni-corrected 95% CI)
US-born NHB	1.36 (1.30–1.43)	–	–	–	–	–
US-born HB	1.11 (0.99–1.25)	0.91 (0.73–1.14)	–	–	–	–
US-born HW	1.24 (0.99–1.55)	0.82 (0.72–0.92)	0.89 (0.70–1.15)	–	–	–
Foreign-born NHW	0.81 (0.71–0.92)	0.59 (0.52–0.68)	0.65 (0.50–0.84)	0.73 (0.61–0.87)	–	–
Foreign-born NHB	1.01 (0.89–1.15)	0.74 (0.65–0.85)	0.82 (0.63–1.05)	0.91 (0.77–1.08)	1.25 (1.04–1.50)	–
Foreign-born HW	0.77 (0.60–0.98)	0.56 (0.44–0.72)	0.62 (0.45–0.86)	0.69 (0.53–0.91)	0.95 (0.72–1.25)	0.76 (0.58–0.999)

Models adjusted for maternal age, marital status, insurance type, educational level, medical comorbidities, tobacco use, and infant birth year. Bonferroni-corrected significant aRRs are shown in bold.